Michelle McNamara passed away suddenly in her sleep at the age of 46 on April 21

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According to Patton Oswalt, who tragically lost his wife in April, 102 days are all you need to perform miracles.

But spending 102 days in a heavy fog of grief and pain? He's still working on it.

Nearly four months after the passing of true-crime writer Michelle McNamara, Oswalt has shared a letter on Facebook that is both funny and moving. In a heartbreaking message to the public, he "thanks" grief, mourns his late wife, praises his daughter and shares his anxiety for the future, the "Today" show reported.

McNamara, who was best known for her website True Crime Diary, passed away suddenly in her sleep at the age of 46 on April 21. His letter is tinged with sadness, anger and heartbreak, yet shines a light on the kindness of friends, family and strangers during this difficult 102-day period, as well as on his wife's impressive achievements.